Ink control mechanism for a pen

Abstract

The ink control structure of a pen includes a pen body and a pen point. The interior of the pen body is an empty cavity for containing ink and the surrounding wall of the pen body is flexible and can be pinched. The inner end of the pen point joins the empty cavity via an ink supply passage. The pen point has hydraulic conductivity and can lead the ink out. The pressure-driven control valve is configured into the ink supply passage and includes a stopper end and an elastic part. The elastic part can normally push the stopper end to pressingly meet a narrow opening in the ink supply passage, thus forming a state that the ink is prevented from a flow out. While under pressure, the ink supply passage is opened to make ink flow downward to the pen point for applying or writing.

1. A pen with an improved ink control mechanism comprising:
 a pen body with an empty cavity internal thereof, said cavity suitable for containing supplied ink, said pen body having a wall surrounding said cavity, said wall being flexible and suitable for being pinched so as to apply pressure to said cavity; 
 a pen point affixed to an end of said pen body, said pen point being hydraulically conductive so as to deliver ink therefrom; 
 an ink supply passage joining an inner end of said pen point to said cavity; and 
 a pressure-driven control valve comprising a stopper end and an elastic part, said elastic part pushing said stopper end so as to meet a narrow opening in said ink supply passage so as to prevent ink from flowing outwardly therefrom, said stopper end separate from said narrow opening when said pen body has pressure applied thereto so as to allow ink to flow downwardly from said ink supply passage to said pen point, said stopper end is a two-section step-type column, said elastic part being of a zigzag sheet shape. 
 
   
   
     2. The pen of  claim 1 , said stopper end and said elastic part being of a plastic-rubber molded material. 
   
   
     3. The pen of  claim 1 , said narrow opening of said ink supply passage comprising an inner block with a protruding pipe, said pipe inserted into said ink supply passage so as to form said narrow opening. 
   
   
     4. The pen of  claim 1 , further comprising;
 a pen cap covering said pen point and a portion of said end of said pen body. 
 
   
   
     5. The pen of  claim 1 , said pen point comprising a double pen point.